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Article: High-performance organic light-emitting diodes with low-efficiency roll-off using bulky tetradentate [Pt(O^N^C^N)] emitters

TitleHigh-performance organic light-emitting diodes with low-efficiency roll-off using bulky tetradentate [Pt(O^N^C^N)] emitters
Authors
KeywordsAmines
Efficiency
Electron transport properties
Luminance
Organic light emitting diodes (OLED)
Issue Date2019
PublisherRSC Publications. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/tc#!recentarticles&all
Citation
Journal of Materials Chemistry C, 2019, v. 7 n. 24, p. 7230-7236 How to Cite?
AbstractHigh-performance organic light-emitting diodes (OLEDs) were realized by utilizing three robust platinum(II) complexes bearing tetradentate O^N^C^N ligands with a bridging tertiary amine (tetra-Pt-N), a biphenyl group with a spiro linkage (tetra-Pt-S) or a sterically encumbered 2,6-dimethyl-4-tert-butylphenyl moiety (tetra-Pt-M). By using a double-host emissive layer (EML) structure and a 10 nm-thick interlayer between the EML and the electron-transport layer (ETL), a maximum power efficiency of over 100 lm W−1, a low turn-on voltage of less than 2.5 V and low efficiency roll-off were achieved. A high external quantum efficiency (EQE) of 19.4% and 20.3% was maintained at 10 000 cd m−2 in OLEDs with tetra-Pt-N and tetra-Pt-M, respectively. Such high efficiency at high luminance could be attributed to the effective suppression of triplet–triplet annihilation (TTA) in our optimized device structure.
Persistent Identifierhttp://hdl.handle.net/10722/272838
ISSN
2017 Impact Factor: 5.976

 

DC FieldValueLanguage
dc.contributor.authorMAO, M-
dc.contributor.authorPeng, J-
dc.contributor.authorLam, TL-
dc.contributor.authorAng, WH-
dc.contributor.authorLi, H-
dc.contributor.authorCheng, G-
dc.contributor.authorChe, CM-
dc.date.accessioned2019-08-06T09:17:31Z-
dc.date.available2019-08-06T09:17:31Z-
dc.date.issued2019-
dc.identifier.citationJournal of Materials Chemistry C, 2019, v. 7 n. 24, p. 7230-7236-
dc.identifier.issn2050-7526-
dc.identifier.urihttp://hdl.handle.net/10722/272838-
dc.description.abstractHigh-performance organic light-emitting diodes (OLEDs) were realized by utilizing three robust platinum(II) complexes bearing tetradentate O^N^C^N ligands with a bridging tertiary amine (tetra-Pt-N), a biphenyl group with a spiro linkage (tetra-Pt-S) or a sterically encumbered 2,6-dimethyl-4-tert-butylphenyl moiety (tetra-Pt-M). By using a double-host emissive layer (EML) structure and a 10 nm-thick interlayer between the EML and the electron-transport layer (ETL), a maximum power efficiency of over 100 lm W−1, a low turn-on voltage of less than 2.5 V and low efficiency roll-off were achieved. A high external quantum efficiency (EQE) of 19.4% and 20.3% was maintained at 10 000 cd m−2 in OLEDs with tetra-Pt-N and tetra-Pt-M, respectively. Such high efficiency at high luminance could be attributed to the effective suppression of triplet–triplet annihilation (TTA) in our optimized device structure.-
dc.languageeng-
dc.publisherRSC Publications. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/tc#!recentarticles&all-
dc.relation.ispartofJournal of Materials Chemistry C-
dc.subjectAmines-
dc.subjectEfficiency-
dc.subjectElectron transport properties-
dc.subjectLuminance-
dc.subjectOrganic light emitting diodes (OLED)-
dc.titleHigh-performance organic light-emitting diodes with low-efficiency roll-off using bulky tetradentate [Pt(O^N^C^N)] emitters-
dc.typeArticle-
dc.identifier.emailLam, TL: joeltl@hku.hk-
dc.identifier.emailCheng, G: ggcheng@hku.hk-
dc.identifier.emailChe, CM: chemhead@hku.hk-
dc.identifier.authorityCheng, G=rp02145-
dc.identifier.authorityChe, CM=rp00670-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1039/C9TC00682F-
dc.identifier.scopuseid_2-s2.0-85067672391-
dc.identifier.hkuros299666-
dc.identifier.volume7-
dc.identifier.issue24-
dc.identifier.spage7230-
dc.identifier.epage7236-
dc.publisher.placeUnited Kingdom-

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